Some definitions of interest.
iff	Def P  Q == (P  Q) & (P  Q)
	Thm* A,B:Prop. (A  B)  Prop
sq_stable	Def SqStable(P) == P  P
	Thm* A:Prop. SqStable(A)  Prop
squash	Def T == {:True| T }
	Thm* A:Prop. A  Prop

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